Larger scale Models (The Tooline Masters) were created to provide better detail than their 1:1 counterparts.
These would be scaled down again when cutting the steel tooling by using a Pantograph machine.

In the beginning, modified AMT 1/25 model kits were used.

In the first couple of years various sizes of Models were used, some as large as a 5up Nomad.

In 1970, instead of everyone making their own, the model making was farmed out to IDA
(Industrial Design Associates) and were consistently made as 4up.